All of the Rebel series film camera use a Canon EF lens mount. All of Canon's digital SLR models can use the same lenses.

Note that most entry level Canon models use a APS-C size sensor that is smaller than 35mm film. As a result, you'll have a narrower angle of view (more apparent magnification) with your existing lenses on this type of camera (because of the smaller sensors, the entire image circle being projected isn't used).

To determine how they compare, just multiply the focal length of a lens by 1.6x. For example, a 28mm lens on a model like the Canon XSi would give you the same angle of view you'd have using a 44.8mm lens on one of your Rebel film cameras (28mm x 1.6 = 44.8mm).

That can be good if you want a longer lens (more apparent magnification). But, you may find yourself lacking on the wide end. That's why the kit lenses bundled with most entry level dSLR models have focal ranges starting out at around 18mm. So, an 18-55mm kit lens on a Digital Rebel would give you roughly the same angle of view you'd have using a 29-80mm lens on a 35mm camera.

Note that some of Canon's models have larger sensors. But, the price of a body tends to increase with sensor size. Models like the Canon XS, XSi, XTi, 40D, and 50D use an APS-C size sensor, which means your lenses will appear to be 1.6x longer than they would on a 35mm camera